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class="post_cover left_radius"><a href="/47899.html" title="SpringMVC学习-1">     <img class="post_bg" data-lazy-src="https://qiniu.codekylin.cn/github/images/20200423185712.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="SpringMVC学习-1"></a></div><div class="recent-post-info"><a class="article-title" href="/47899.html" title="SpringMVC学习-1">SpringMVC学习-1</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2019-12-19T07:46:59.000Z" title="发表于 2019-12-19 15:46:59">2019-12-19</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/SSM/">SSM</a><i class="fas fa-angle-right"></i><a class="article-meta__categories" href="/categories/SSM/SpringMVC/">SpringMVC</a></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-comments"></i><a href="/47899.html#post-comment" itemprop="discussionUrl"><span class="valine-comment-count" data-xid="/47899.html" itemprop="commentCount"></span></a><span class="article-meta-label"> 条评论</span></span></div><div class="content">SpringMVC 简介Spring MVC属于SpringFrameWork的后续产品，已经融合在Spring Web Flow里面。Spring 框架提供了构建 Web 应用程序的全功能 MVC 模块。使用 Spring 可插入的 MVC 架构，从而在使用Spring进行WEB开发时，可以选择使用Spring的Spring MVC框架或集成其他MVC开发框架，如Struts1(现在一般不用)，Struts 2(一般老项目使用)等。
@WebServlet中配置”/“,控制器拦截所有请求，但是不会拦截到.jsp文件
@WebServlet中配置”/*“,控制器拦截所有请求，包括拦截到.jsp文件


SpringMVC 中重要组件
DispatcherServlet：前端控制器,接收所有请求(如果配置/不包含jsp)
HandlerMapping：解析请求格式的.判断希望要执行哪个具体的方法.
HandlerAdapter：负责调用具体的方法.
ViewResovler：视图解析器,解析结果,准备跳转到具体的物理视图

SpringMVC运行原理图
12345678910111213 ...</div></div></div><div class="recent-post-item"><div class="post_cover right_radius"><a href="/44662.html" title="JavaWeb-文件下载">     <img class="post_bg" data-lazy-src="https://qiniu.codekylin.cn/github/img/img/wallhaven-yjy95k.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="JavaWeb-文件下载"></a></div><div class="recent-post-info"><a class="article-title" href="/44662.html" title="JavaWeb-文件下载">JavaWeb-文件下载</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2019-12-19T06:40:58.000Z" title="发表于 2019-12-19 14:40:58">2019-12-19</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-comments"></i><a href="/44662.html#post-comment" itemprop="discussionUrl"><span class="valine-comment-count" data-xid="/44662.html" itemprop="commentCount"></span></a><span class="article-meta-label"> 条评论</span></span></div><div class="content">文件下载浏览器默认下载文件的方式为inline即能打开就打开，不能打开就下载。通过给a标签href中的属性值赋值，可以完成对一些浏览器无法解析打开的文件进行下载。但是当要下载的文件浏览器能解析打开，要如何告诉浏览器进行下载此文件呢？


通知客户端浏览器: 这是一个需要下载的文件, 不能再按普通的 html 的方式打开.
12//即设置一个响应的类型: application/x-msdownloadresponse.setContentType(&quot;application/x-msdownload&quot;);
通知客户端浏览器: 不再有浏览器来处理该文件, 而是交由用户自行处理设置响应流中文件进行下载,attachment以附件形式下载,filename= 表示下载显示的下载文件名。
12//设置用户处理的方式: 响应头: Content-Dispositionresponse.setHeader(&quot;Content-Disposition&quot;, &quot;attachment;filename=abc.txt&quot;);


12345678910 ...</div></div></div><div class="recent-post-item"><div class="post_cover left_radius"><a href="/51318.html" title="JavaWeb-文件上传">     <img class="post_bg" data-lazy-src="https://qiniu.codekylin.cn/github/img/img/wallhaven-2e1g7x.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="JavaWeb-文件上传"></a></div><div class="recent-post-info"><a class="article-title" href="/51318.html" title="JavaWeb-文件上传">JavaWeb-文件上传</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2019-12-19T02:20:42.000Z" title="发表于 2019-12-19 10:20:42">2019-12-19</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-comments"></i><a href="/51318.html#post-comment" itemprop="discussionUrl"><span class="valine-comment-count" data-xid="/51318.html" itemprop="commentCount"></span></a><span class="article-meta-label"> 条评论</span></span></div><div class="content">文件上传1.普通表单提交默认enctype=”application/x-www-form-urlencoded”；但是当表单中存在文件类型时，需要设置enctype=”multipart/form-data”，它不对字符进行编码，用于发送二进制的文件（即所有文件类型，如视频、图片、音乐、文档都可以用此类型entype）；还有一种enctype=”text/plain”用于发送纯文本内容。
2.表单请求方式必须为post。
3.接收时不能再用request.getParameter()，而是request.getInputStream()解析二进制流，得到ServletInputStream对象。






当我们使用request.getInput直接获取到的字节流，后续进行打印数据的时候。会自动加上许多表单，文件的属性和属性值，还有分隔符。上传的是纯文本文件时，打印出来还能看到清除文件内容。但当上传的是非文本文件的时候，自动加上的属性和属性值，会导致文件不能正常显示。这时候我们就需要解析request.getInpustream()。
FileUpload文件上传FileUplo ...</div></div></div><div class="recent-post-item"><div class="post_cover right_radius"><a href="/30418.html" title="Java-IO流-8">     <img class="post_bg" data-lazy-src="https://qiniu.codekylin.cn/github/img/img/博客封面12.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Java-IO流-8"></a></div><div class="recent-post-info"><a class="article-title" href="/30418.html" title="Java-IO流-8">Java-IO流-8</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2019-12-19T01:28:39.000Z" title="发表于 2019-12-19 09:28:39">2019-12-19</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/Java/">Java</a><i class="fas fa-angle-right"></i><a class="article-meta__categories" href="/categories/Java/IO%E6%B5%81/">IO流</a></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-comments"></i><a href="/30418.html#post-comment" itemprop="discussionUrl"><span class="valine-comment-count" data-xid="/30418.html" itemprop="commentCount"></span></a><span class="article-meta-label"> 条评论</span></span></div><div class="content">处理流之三：标准输入、输出流System.in和System.out分别代表了系统标准的输入和输出设备 

默认输入设备是：键盘，输出设备是：显示器 
System.in的类型是InputStream 
System.out的类型是PrintStream，其是OutputStream的子类 FilterOutputStream 的子类 
重定向：通过System类的setIn，setOut方法对默认设备进行改变。 
public static void setIn(InputStream in) 
public static void setOut(PrintStream out)

从键盘输入字符串，要求将读取到的整行字符串转成大写输出。然后继续进行输入操作，直至当输入“e”或者“exit”时，退出程序。

处理流之四：打印流实现将基本数据类型的数据格式转化为字符串输出 

打印流：PrintStream和PrintWriter  提供了一系列重载的print()和println()方法，用于多种数据类型的输出 

PrintStream和PrintWriter的输出不会抛出IOE ...</div></div></div><div class="recent-post-item"><div class="post_cover left_radius"><a href="/29330.html" title="Java-IO流-7">     <img class="post_bg" data-lazy-src="https://qiniu.codekylin.cn/github/img/img/wallhaven-mdz9x9.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Java-IO流-7"></a></div><div class="recent-post-info"><a class="article-title" href="/29330.html" title="Java-IO流-7">Java-IO流-7</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2019-12-19T01:10:50.000Z" title="发表于 2019-12-19 09:10:50">2019-12-19</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/Java/">Java</a><i class="fas fa-angle-right"></i><a class="article-meta__categories" href="/categories/Java/IO%E6%B5%81/">IO流</a></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-comments"></i><a href="/29330.html#post-comment" itemprop="discussionUrl"><span class="valine-comment-count" data-xid="/29330.html" itemprop="commentCount"></span></a><span class="article-meta-label"> 条评论</span></span></div><div class="content">字符编码编码表的由来

计算机只能识别二进制数据，早期由来是电信号。为了方便应用计算机，让它可以识 别各个国家的文字。就将各个国家的文字用数字来表示，并一一对应，形成一张表。 这就是编码表。 

常见的编码表

ASCII：美国标准信息交换码。 用一个字节的7位可以表示。
ISO8859-1：拉丁码表。欧洲码表 用一个字节的8位表示。
GB2312：中国的中文编码表。最多两个字节编码所有字符
GBK：中国的中文编码表升级，融合了更多的中文文字符号。最多两个字节编码
Unicode：国际标准码，融合了目前人类使用的所有字符。为每个字符分配唯一的字符码。所有的文字都用两个字节来表示。
UTF-8：变长的编码方式，可用1-4个字节来表示一个字符。





字符集和字符编码的区别1、字符，字符集，字符编码概念
字符：在计算机和电信技术中，一个字符是一个单位的字形、类字形单位或符号的基本信息。即一个字符可以是一个中文汉字、一个英文字母、一个阿拉伯数字、一个标点符号等。
字符集：多个字符的集合。例如GB2312是中国国家标准的简体中文字符集，GB2312收录简化汉字（6763个）及一般符号、序号 ...</div></div></div><div class="recent-post-item"><div class="post_cover right_radius"><a href="/45651.html" title="Java-IO流-6">     <img class="post_bg" data-lazy-src="https://qiniu.codekylin.cn/github/img/img/deepin-3.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Java-IO流-6"></a></div><div class="recent-post-info"><a class="article-title" href="/45651.html" title="Java-IO流-6">Java-IO流-6</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2019-12-19T00:22:38.000Z" title="发表于 2019-12-19 08:22:38">2019-12-19</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/Java/">Java</a><i class="fas fa-angle-right"></i><a class="article-meta__categories" href="/categories/Java/IO%E6%B5%81/">IO流</a></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-comments"></i><a href="/45651.html#post-comment" itemprop="discussionUrl"><span class="valine-comment-count" data-xid="/45651.html" itemprop="commentCount"></span></a><span class="article-meta-label"> 条评论</span></span></div><div class="content">处理流之二:转换流转换流提供了在字节流和字符流之间的转换
Java API提供了两个转换流：

InputStreamReader：将InputStream转换为Reader 字节输入流-&gt;字符输出流
OutputStreamWriter：将Writer转换为OutputStream 字符输入流-&gt;字节输出流

字节流中的数据都是字符时，转成字符流操作更高效。
很多时候我们使用转换流来处理文件乱码问题。实现编码和解码的功能。
解码：字节、字节数组  —&gt;字符数组、字符串
编码：字符数组、字符串 —&gt; 字节、字节数组



InputStreamReader和OutputStreamWriterInputStreamReader
实现将字节的输入流按指定字符集转换为字符的输入流。 需要和InputStream“套接”。
常用构造器
1public InputStreamReader(InputStream in)

1public InputSreamReader(InputStream in,String charsetName) 

如： Reader isr ...</div></div></div><div class="recent-post-item"><div class="post_cover left_radius"><a href="/45843.html" title="Java-IO流-5">     <img class="post_bg" data-lazy-src="https://timgsa.baidu.com/timg?image&amp;quality=80&amp;size=b9999_10000&amp;sec=1577433535&amp;di=0d619b39ae6febc78251b085753ce55c&amp;imgtype=jpg&amp;er=1&amp;src=http%3A%2F%2Fbenyouhuifile.it168.com%2Fforum%2Fday_110122%2F11012216140c3eddeed850474b.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Java-IO流-5"></a></div><div class="recent-post-info"><a class="article-title" href="/45843.html" title="Java-IO流-5">Java-IO流-5</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2019-12-18T10:26:54.000Z" title="发表于 2019-12-18 18:26:54">2019-12-18</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/Java/">Java</a><i class="fas fa-angle-right"></i><a class="article-meta__categories" href="/categories/Java/IO%E6%B5%81/">IO流</a></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-comments"></i><a href="/45843.html#post-comment" itemprop="discussionUrl"><span class="valine-comment-count" data-xid="/45843.html" itemprop="commentCount"></span></a><span class="article-meta-label"> 条评论</span></span></div><div class="content">处理流之一:缓冲流处理流，就是“套接”在已有的流的基础上。
为了提高数据读写的速度，Java API提供了带缓冲功能的流类，在使用这些流类 时，会创建一个内部缓冲区数组，缺省使用8192个字节(8Kb)的缓冲区。
当读取数据时，数据按块读入缓冲区，其后的读操作则直接访问缓冲区
当使用BufferedInputStream读取字节文件时，BufferedInputStream会一次性从 文件中读取8192个(8Kb)，存在缓冲区中，直到缓冲区装满了，才重新从文件中 读取下一个8192个字节数组。





缓冲流要“套接”在相应的节点流之上，根据数据操作单位可以把缓冲流分为：

BufferedInputStream 和 BufferedOutputStream
BufferedReader 和 BufferedWriter

向流中写入字节时，不会直接写到文件，先写到缓冲区中直到缓冲区写满，BufferedOutputStream才会把缓冲区中的数据一次性写到文件里。使用方法 flush()可以强制将缓冲区的内容全部写入输出流。
flush()方法的使用：手动将buffer中内容写入文 ...</div></div></div><div class="recent-post-item"><div class="post_cover right_radius"><a href="/29650.html" title="Java-IO流-4">     <img class="post_bg" data-lazy-src="https://qiniu.codekylin.cn/github/img/img/wallhaven-2k8wlg.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Java-IO流-4"></a></div><div class="recent-post-info"><a class="article-title" href="/29650.html" title="Java-IO流-4">Java-IO流-4</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2019-12-18T08:38:21.000Z" title="发表于 2019-12-18 16:38:21">2019-12-18</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/Java/">Java</a><i class="fas fa-angle-right"></i><a class="article-meta__categories" href="/categories/Java/IO%E6%B5%81/">IO流</a></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-comments"></i><a href="/29650.html#post-comment" itemprop="discussionUrl"><span class="valine-comment-count" data-xid="/29650.html" itemprop="commentCount"></span></a><span class="article-meta-label"> 条评论</span></span></div><div class="content">FileInputStreamFileInputStream是Java语言中抽象类InputStream用来具体实现类的创建对象。FileInputStream可以从文件系统中的某个文件中获得输入字节，获取的文件可用性取决于主机环境。(输入流 字节流 节点流)
FileInputStream通过打开与实际文件的连接来创建一个文件，该文件由文件系统中的File 对象命名file。
1public FileInputStream​(File file)	
FileInputStream通过使用文件描述符创建一个，该描述符 fdObj表示与文件系统中实际文件的现有连接。
1public FileInputStream​(FileDescriptor fdObj)	

FileInputStream通过打开与实际文件的连接来创建一个文件，该文件由name 文件系统中的路径名命名。
1public FileInputStream​(String name)	

FileInputStream操作文本文件时并在控制台打印时的问题

FileOutputStreamFileOutputStream流 ...</div></div></div><div class="recent-post-item"><div class="post_cover left_radius"><a href="/45459.html" title="Java-IO流-3">     <img class="post_bg" data-lazy-src="https://qiniu.codekylin.cn/github/img/img/wallhaven-4do8mo.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Java-IO流-3"></a></div><div class="recent-post-info"><a class="article-title" href="/45459.html" title="Java-IO流-3">Java-IO流-3</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2019-12-18T06:01:14.000Z" title="发表于 2019-12-18 14:01:14">2019-12-18</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/Java/">Java</a><i class="fas fa-angle-right"></i><a class="article-meta__categories" href="/categories/Java/IO%E6%B5%81/">IO流</a></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-comments"></i><a href="/45459.html#post-comment" itemprop="discussionUrl"><span class="valine-comment-count" data-xid="/45459.html" itemprop="commentCount"></span></a><span class="article-meta-label"> 条评论</span></span></div><div class="content">IO流操作文件
创建源 File

选择创建流 InputStream OutputStream Reader Writer

读写操作 write() read()

关闭资源 close()


FileReaderFileReader类从InputStreamReader类继承而来。该类按字符读取流中数据。可以通过以下几种构造方法创建需要的对象。(输入流 节点流 字符流 )
在给定从中读取数据的 File 的情况下创建一个新 FileReader。
1public FileReader(File file)
在给定从中读取数据的 FileDescriptor 的情况下创建一个新 FileReader。
1public FileReader(FileDescriptor fd)
在给定从中读取数据的文件名的情况下创建一个新 FileReader。查看源码得知，当fileName不为空时，会调用new file（fileName）创建出一个file对象，从而简化代码。
1public FileReader(String fileName) 


)
将的hello.txt文件内容读入 ...</div></div></div><div class="recent-post-item"><div class="post_cover right_radius"><a href="/29010.html" title="Java-IO流-2">     <img class="post_bg" data-lazy-src="https://qiniu.codekylin.cn/github/img/img/wallhaven-mdelz8.png" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Java-IO流-2"></a></div><div class="recent-post-info"><a class="article-title" href="/29010.html" title="Java-IO流-2">Java-IO流-2</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2019-12-17T11:57:41.000Z" title="发表于 2019-12-17 19:57:41">2019-12-17</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/Java/">Java</a><i class="fas fa-angle-right"></i><a class="article-meta__categories" href="/categories/Java/IO%E6%B5%81/">IO流</a></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-comments"></i><a href="/29010.html#post-comment" itemprop="discussionUrl"><span class="valine-comment-count" data-xid="/29010.html" itemprop="commentCount"></span></a><span class="article-meta-label"> 条评论</span></span></div><div class="content">Java IO原理I/O是Input/Output的缩写， I/O技术是非常实用的技术，用于处理设备之间的数据传输。如读/写文件，网络通讯等。
Java程序中，对于数据的输入/输出操作以“流(stream)” 的 方式进行。
java.io包下提供了各种“流”类和接口，用以获取不同种类的 数据，并通过标准的方法输入或输出数据
输入input：读取外部数据（磁盘、光盘等存储设备的数据）到 程序（内存）中。
输出output：将程序（内存） 数据输出到磁盘、光盘等存储设 备中。


流的分类按操作数据单位不同分为：字节流(8 bit)，字符流(16 bit)
按数据流的流向不同分为：输入流，输出流
按流的角色的不同分为：节点流（文件流），处理流

Java的IO流共涉及40多个类，实际上非常规则，都是从如下4个 抽象基类派生的。
由这四个类派生出来的子类名称都是以其父类名作为子类名后缀。
节点流：直接从数据源或目的地读写数据
处理流：不直接连接到数据源或目的地，而是“连接”在已存 在的流（节点流或处理流）之上，通过对数据的处理为程序提 供更为强大的读写功能。
对于文本文件(.txt,.ja ...</div></div></div><nav id="pagination"><div class="pagination"><a class="extend prev" rel="prev" href="/page/25/#content-inner"><i class="fas fa-chevron-left fa-fw"></i></a><a class="page-number" href="/">1</a><span class="space">&hellip;</span><a class="page-number" href="/page/25/#content-inner">25</a><span class="page-number current">26</span><a class="page-number" href="/page/27/#content-inner">27</a><span class="space">&hellip;</span><a class="page-number" href="/page/37/#content-inner">37</a><a class="extend next" rel="next" href="/page/27/#content-inner"><i class="fas fa-chevron-right fa-fw"></i></a></div></nav></div><div class="aside-content" id="aside-content"><div class="card-widget card-info"><div class="card-info-avatar is-center"><img class="avatar-img" data-lazy-src="https://qiniu.codekylin.cn/img/20200807181526.jpg" onerror="this.onerror=null;this.src='https://qiniu.codekylin.cn/github/img/friend_404.gif'" alt="avatar"/><div 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